Provided is a pressing plate switching dedicated voltmeter for a trip-out circuit of a relay protection system. The pressing plate switching dedicated voltmeter comprises a voltmeter and is characterized in that the voltmeter is not provided with shifts; a positive jack and a negative jack for detecting voltage are disposed on a housing; a positive meter pen and a negative meter pen are provided; one end of each meter pen is a clamping end; the other end of each meter end is a plug end in cooperation with the positive jack or the negative jack; and a high-voltage-resistant large-power resistor more than or equal to 4k[omega] is connected between the two ends of each meter pen. The pressing plate switching dedicated voltmeter may prevent erroneous shifts and erroneous jacks from being selected. Measurement safety can be guaranteed even when short circuit or internal insulation breakdown happens to the pressing plate switching dedicated voltmeter.